diff --git a/v4.2/main.c b/v4.2/main.c
new file mode 100644
index 0000000..21389a4
--- /dev/null
+++ b/v4.2/main.c
@@ -0,0 +1,16 @@
+#include <stdio.h>
+#include "qinit.h"
+
+#define NUM_SQUARES 100
+
+
+int main(void) {
+    int squares[NUM_SQUARES];
+
+    qinit(&squares[0], NUM_SQUARES);
+
+    for (int i = 0; i < NUM_SQUARES; i++) {
+        printf("%d\n", squares[i]);
+    }
+    return 0;
+}
diff --git a/v4.2/qinit.c b/v4.2/qinit.c
new file mode 100644
index 0000000..16cd563
--- /dev/null
+++ b/v4.2/qinit.c
@@ -0,0 +1,5 @@
+void qinit(int arr[], int len) {
+    for (int i = 0; i < len; i++) {
+        arr[i] = (i + 1) * (i + 1);
+    }
+}
diff --git a/v4.2/qinit.h b/v4.2/qinit.h
new file mode 100644
index 0000000..57f7809
--- /dev/null
+++ b/v4.2/qinit.h
@@ -0,0 +1 @@
+extern void qinit(int arr[], int len);